Method for transmitting and receiving downlink pre-emption indication information using bitmap in new radio networks and apparatus thereof

ABSTRACT

Provided is a method for transmitting and receiving downlink pre-emption indication information using a bitmap in a next-generation/5G radio access network. The method may include: receiving monitoring configuration information for downlink pre-emption indication information from a base station; monitoring downlink pre-emption indication information based on the monitoring configuration information; and receiving the downlink pre-emption indication information from the base station, wherein the downlink pre-emption indication information includes a bitmap indicating information on at least one of time-section resources and frequency-section resources in which pre-emption has occurred, among reference downlink resources.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority from Korean Patent Application Nos.10-2017-0035615, 10-2017-0101169 & 10-2018-0014576 filed on Mar. 21,2017, Aug. 9, 2017 & Feb. 6, 2018 which are hereby incorporated byreference for all purposes as if fully set forth herein.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present embodiments relate to a method for transmitting andreceiving downlink pre-emption indication information using a bitmap ina next-generation/5G radio access network {hereinafter, also referred toas “NR (New Radio)”}.

2. Description of the Prior Art

3rd generation partnership project (3GPP) has recently approved thestudy item “Study on New Radio Access Technology” for studyingnext-generation/5G radio access technology. Based on the same, 3GPP isdiscussing a frame structure, channel coding & modulation, waveform &multiple access schemes, and the like for NR (New Radio) in radio accessnetwork working group 1 (RAN WG1). It is required to design the NR tosatisfy various requirements for respective segmented and specifiedusage scenarios, as well as an improved data transmission rate incomparison with long term evolution (LTE)/LTE-Advanced.

Enhanced Mobile BroadBand (eMBB), massive Machine-Type Communication(mMTC), and Ultra Reliable and Low Latency Communication (URLLC) havebeen proposed as typical usage scenarios of the NR, and flexible framestructure design is required, compared to LTE/LTE-Advanced, to meet therequirements of the respective scenarios.

In particular, services, such as eMBB and mMTC in the NR, are moreefficient as time-section resource assignment is lengthened in terms ofcell throughput and coverage, while a service of URLLC is more efficientas time-section resource assignment is shortened because of a latencyproblem. Therefore, it is necessary to support efficient multiplexingfor data traffic between the respective services in a network thatsimultaneously provides the above-mentioned eMBB, mMTC, and URLLCservices.

SUMMARY OF THE INVENTION

An aspect of the present embodiments is to provide a specific method forsupporting efficient multiplexing for data traffic between respectiveservices in a network that simultaneously provides the eMBB, mMTC, andURLLC services.

An embodiment, which has been made in order to solve the above problem,provides a method for receiving downlink pre-emption indicationinformation by a user equipment, the method including: receivingmonitoring configuration information for downlink pre-emption indicationinformation from a base station; monitoring downlink pre-emptionindication information based on the monitoring configurationinformation; and receiving the downlink pre-emption indicationinformation from the base station, wherein the downlink pre-emptionindication information includes a bitmap indicating information ontime-section resources or frequency-section resources in whichpre-emption has occurred, among reference downlink resources.

Another embodiment provides a method for transmitting downlinkpre-emption indication information by a base station, the methodincluding: configuring monitoring configuration information for downlinkpre-emption indication information; transmitting the monitoringconfiguration information to a user equipment; and transmitting thedownlink pre-emption indication information to the user equipment whendownlink pre-emption occurs, wherein the downlink pre-emption indicationinformation includes a bitmap indicating information on time-sectionresources or frequency-section resources in which pre-emption hasoccurred, among reference downlink resources.

Another embodiment provides a user equipment for receiving downlinkpre-emption indication information, which includes: a receiverconfigured to receive monitoring configuration information for downlinkpre-emption indication information from a base station and configured toreceive the downlink pre-emption indication information from the basestation; and a controller configured to monitor the downlink pre-emptionindication information based on the monitoring configurationinformation, wherein the downlink pre-emption indication informationincludes a bitmap indicating information on time-section resources orfrequency-section resources in which pre-emption has occurred, amongreference downlink resources.

Further, another embodiment provides a base station for transmittingdownlink pre-emption indication information, which includes: acontroller configured to configure monitoring configuration informationfor downlink pre-emption indication information; and a transmitterconfigured to transmit the monitoring configuration information to auser equipment and configured to transmit the downlink pre-emptionindication information to the user equipment when downlink pre-emptionoccurs, wherein the downlink pre-emption indication information includesa bitmap indicating information on time-section resources orfrequency-section resources in which pre-emption has occurred, amongreference downlink resources.

According to the present embodiments, it is possible to provide aspecific method for supporting efficient multiplexing for data trafficbetween the respective services in a network in which the eMBB, mMTC,and URLLC services are mixed in the NR.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of the presentdisclosure will be more apparent from the following detailed descriptiontaken in conjunction with the accompanying drawings, in which:

FIG. 1 is a diagram illustrating OFDM symbol alignment in case of usingdifferent subcarrier spacing according to at least one of embodiments;

FIG. 2 is a diagram illustrating a resource when a single pre-emptionoccurs between eMBB and URLLC in the downlink according to at least oneof embodiments;

FIG. 3 is a diagram illustrating resources when multiple pre-emptionoccurs between eMBB and URLLC in the downlink according to at least oneof embodiments;

FIG. 4 is a flowchart illustrating a procedure of a user equipment forreceiving downlink pre-emption indication information in at least one ofembodiment;

FIG. 5 is a flowchart illustrating a procedure of a base station fortransmitting downlink pre-emption indication information in at least oneembodiment;

FIG. 6 is a block diagram illustrating a base station according to atleast one of embodiments; and

FIG. 7 is a block diagram illustrating a user equipment according to atleast one of embodiments.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

Hereinafter, embodiments of the present disclosure will be described indetail with reference to the accompanying drawings. In adding referencenumerals to elements in each drawing, the same elements will bedesignated by the same reference numerals, if possible, although theyare shown in different drawings. Further, in the following descriptionof the present disclosure, a detailed description of known functions andconfigurations incorporated herein will be omitted when it is determinedthat the description may make the subject matter of the presentdisclosure rather unclear.

As used herein, a wireless communication system may be a system forproviding various communication services such as a voice service and apacket data service. The wireless communication system may include aUser Equipment (UE) and a Base Station (BS or an eNB).

The user equipment may be a comprehensive concept that indicates aterminal for use in wireless communication, including a UE (UserEquipment) in wideband code division multiple access (WCDMA), LTE, highspeed packet access (HSPA), international mobile telecommunication(IMT-2020) (5G or New Radio), and the like, and a MS (Mobile station), aUT (User Terminal), an SS (Subscriber Station), a wireless device, andthe like in global systems for mobile communication (GSM).

A base station or a cell may generally refer to a station wherecommunication with a User Equipment (UE) is performed. Such a basestation or a cell may denote, inclusively, all of various coverage areassuch as a Node-B, an evolved Node-B (eNB), gNode-B (gNB), Low Power Node(LPN), a Sector, a Site, various types of antennas, a Base TransceiverSystem (BTS), an Access Point, a Point (e.g., transmitting point,receiving point, or transceiving point), a Relay Node, a Mega Cell, aMacro Cell, a Micro Cell, a Pico Cell, a Femto Cell, a Remote Radio Head(RRH), a Radio Unit (RU), and a Small Cell.

Each of the above mentioned various cells has a base station thatcontrols a corresponding cell, and thus, the base station may beconstrued in two ways. 1) the base station may be a device itself thatprovides a megacell, a macrocell, a microcell, a picocell, a femtocell,and a small cell in association with a wireless area, or 2) the basestation may indicate a wireless area itself. In 1), all devices thatinteract with one another so as to enable the devices that provide apredetermined wireless area to be controlled by an identical entity orto cooperatively configure the wireless area, may be indicated as a basestation. Based on a configuration type of a wireless area, a point, atransmission/reception point, a transmission point, a reception point,or the like may be an embodiment of a base station. In ii), a wirelessarea itself that receives or transmits a signal from a perspective of aterminal or a neighbouring base station, may be indicated as a basestation.

In the present specification, a cell may refer to the coverage of asignal transmitted from a transmission/reception point, a componentcarrier having the coverage of the signal transmitted from thetransmission/reception point (transmission point ortransmission/reception point), or the transmission/reception pointitself.

In the specification, the user equipment and the base station are usedas two (uplink or downlink) inclusive transceiving subjects to embodythe technology and technical concepts described in the specifications.However, the user equipment and the base station may not be limited to apredetermined term or word.

Here, Uplink (UL) refers to a scheme for a UE to transmit and receivedata to/from a base station, and Downlink (DL) refers to a scheme for abase station to transmit and receive data to/from a UE.

Uplink transmission and downlink transmission may be performed using oneof i) a TDD (Time Division Duplex) scheme that performs transmissionbased on different times and ii) an FDD (Frequency Division Duplex)scheme that performs transmission based on different frequencies or amixed scheme of the TDD and FDD schemes.

Further, in a wireless communication system, a standard may be developedby configuring an uplink and a downlink based on a single carrier or apair of carriers.

The uplink and the downlink may transmit control information through acontrol channel, such as a PDCCH (Physical Downlink Control CHannel),PUCCH (Physical Uplink Control CHannel), and the like, and may beconfigured as a data channel, such as PDSCH (Physical Downlink SharedCHannel), PUSCH (Physical Uplink Shared CHannel), and the like, totransmit data.

A downlink may refer to communication or a communication path from amulti-transmission/reception point to a terminal, and an uplink mayrefer to communication or a communication path from a terminal to amulti-transmission/reception point. In a downlink, a transmitter may bea part of a multiple transmission/reception point and a receiver may bea part of a terminal. In an uplink, a transmitter may be a part of aterminal and a receiver may be a part of a multipletransmission/reception point.

Hereinafter, a situation, in which signals are transmitted and receivedthrough a channel such as a PUCCH, a PUSCH, a PDCCH, or a PDSCH, will beexpressed as the transmission and reception of a PUCCH, a PUSCH, aPDCCH, or a PDSCH.

Meanwhile, higher layer signalling includes an radio resource control(RRC) signalling that transmits RRC information including an RRCparameter.

A base station performs downlink transmission to terminals. A basestation may transmit a physical downlink control channel fortransmitting downlink control information such as scheduling required toreceive a downlink data channel that is a main physical channel forunicast transmission, and scheduling approval information fortransmission on an uplink data channel. Hereinafter, transmission andreception of a signal through each channel will be described astransmission and reception of a corresponding channel.

Varied multiple access schemes may be unrestrictedly applied to thewireless communication system. Various multiple access schemes, such asTDMA (Time Division Multiple Access), FDMA (Frequency Division MultipleAccess), CDMA (Code Division Multiple Access), OFDMA (OrthogonalFrequency Division Multiple Access), NOMA (Non-Orthogonal MultipleAccess), OFDM-TDMA, OFDM-FDMA, OFDM-CDMA, and the like may be used.Here, NOMA includes SCMA (Sparse Code Multiple Access), LDS (Low CostSpreading), and the like.

An embodiment of the present disclosure may be applicable to resourceallocation in an asynchronous wireless communication scheme that evolvesinto LTE/LTE-advanced and IMT-2020 through GSM, WCDMA, and HSPA, and maybe applicable to resource allocation in a synchronous wirelesscommunication scheme that evolves into CDMA, CDMA-2000, and UMB.

In the present specifications, a machine type communication (MTC)terminal refers to a terminal that is low cost (or is not verycomplexity), a terminal that supports coverage enhancement, or the like.Alternatively, in the present specifications, the MTC terminal refers toa terminal that is defined as a predetermined category for maintaininglow costs (or low complexity) and/or coverage enhancement.

In other words, in the present specifications, the MTC terminal mayrefer to a newly defined 3GPP Release 13 low cost (or low complexity) UEcategory/type, which executes LTE-based MTC related operations.Alternatively, in the present specifications, the MTC terminal may referto a UE category/type that is defined in or before 3GPP Release-12 thatsupports the enhanced coverage in comparison with the existing LTEcoverage, or supports low power consumption, or may refer to a newlydefined Release 13 low cost (or low complexity) UE category/type.Alternatively, the MTC terminal may refer to a further Enhanced MTCterminal defined in Release-14.

In the present specification, a NarrowBand-Internet of Things (NB-IoT)user equipment represents a user equipment supporting radio access forthe cellular IoT. The objectives of NB-IoT technology include improvedindoor coverage, support for large-scale and low-speed user equipments,low-latency sensitivity, low-cost user equipments, low powerconsumption, and optimized network architecture.

Enhanced Mobile Broadband (eMBB), massive Machine-Type Communication(mMTC), and Ultra Reliable and Low Latency Communication (URLLC) havebeen proposed as typical usage scenarios in NR (New Radio). Thus, theyare under discussion in 3GPP.

In the present specification, a frequency, a frame, a subframe, aresource, a resource block, a region, a band, a subband, a controlchannel, a data channel, a synchronization signal, various referencesignals, various signals, and various messages in relation to NR (NewRadio) may be interpreted according to various meanings, which have beenused in the past, are being used presently, or will be used in thefuture.

NR (New Radio)

Recently, 3GPP has approved the study item “Study on New Radio AccessTechnology” for research on next-generation/5G radio access technology,and has started discussions on a frame structure, channel coding &modulation, waveform & multiple access schemes, and the like for NR (NewRadio) based on the same.

It is required to design the NR to satisfy various requirements forrespective segmented and specified usage scenarios, as well as animproved data transmission rate in comparison with LTE/LTE-Advanced. Inparticular, enhanced Mobile BroadBand (eMBB), massive Machine-TypeCommunication (mMTC), and Ultra Reliable and Low Latency Communication(URLLC) have been proposed as typical usage scenarios of the NR, andflexible frame structure design is required, compared toLTE/LTE-Advanced, in order to meet the requirements of the respectivescenarios.

More specifically, eMBB, mMTC, and URLLC are under consideration astypical usage scenarios of the NR, which are under discussion in 3GPP.The respective usage scenarios have different requirements for datarates, latency, coverage, or the like. Thus, in order to efficientlysatisfy the requirements for the respective usage scenarios through afrequency band constituting an NR system, there is a need for a methodof efficiently multiplexing radio resource units on the basis ofdifferent numerologies (e.g., subcarrier spacing, subframes, TTIs, orthe like).

To this end, there have been discussions on a method of multiplexing andsupporting numerologies having different subcarrier spacing (SCS)values, based on TDM, FDM, or TDM/FDM, through a single NR carrier and amethod of supporting one or more time units when a scheduling unit isconfigured in a time domain. In this regard, in the NR, a subframe hasbeen defined as one of time-domain structures, and there was a decisionto define, as a reference numerology for defining corresponding subframeduration, a single subframe duration including 14 OFDM symbols of normalCP overhead on the basis of 15 kHz-subcarrier spacing (SCS), which isthe same as LTE. According to this, the subframe in the NR has a timeduration of 1 ms. However, unlike the LTE, a slot and a mini-slot may bedefined as a time unit, which is a basis of actual uplink/downlink datascheduling, for the absolute reference time duration in the subframe ofthe NR. In this case, the number of OFDM symbols (a y-value)constituting the corresponding slot has been determined to have a valueof y=14 irrespective of the numerology.

Accordingly, any slot may include 14 symbols. All of the symbols may beused for downlink (DL) transmission, all of the symbols may be used foruplink (UL) transmission, or the symbols may be used in the form of a DLportion+a gap+a UL portion according to a transmission direction of thecorresponding slot.

In addition, a mini-slot including fewer symbols than a correspondingslot may be defined in a numerology (or SCS), and based on the same ashort time-domain scheduling interval may be configured foruplink/downlink data transmission/reception, or a long time-domainscheduling interval may be configured through slot aggregation foruplink/downlink data transmission/reception.

In particular, in the case of transmission/reception of latency-criticaldata such as URLLC, when the scheduling is performed in a slot unit of0.5 ms (7 symbols) or 1 ms (14 symbols) defined in a frame structurebased on a numerology having a small SCS value such as 15 kHz, it may bedifficult to satisfy the latency requirements. Therefore, a mini-slotincluding fewer OFDM symbols than the corresponding slot may be defined,thereby enabling the scheduling for latency-critical data, such as theURLLC, based on the same.

Alternatively, a method is also under consideration for supportingnumerologies having different SCS values by multiplexing the same usinga TDM scheme or an FDM scheme in a single NR carrier as described above,thereby scheduling data to conform to the latency requirements based ona slot (mini-slot) length defined for each numerology. For example, inthe case where the SCS is 60 kHz as shown in FIG. 1, the symbol lengththereof is reduced to about ¼ of the symbol length for the SCS of 15kHz. Therefore, when a single slot includes 7 OFDM symbols, the 15kHz-based slot is 0.5 ms long, while the 60 kHz-based slot length isreduced to about 0.125 ms.

That is, in the NR, there is discussion on a method for satisfying therespective requirements of the URLLC and the eMBB by defining differentSCS or different TTIs.

As described above, there is a discussion on a method for supportingscheduling units having different lengths in a time domain to satisfyvarious usage scenarios in the NR. In particular, to satisfy the URLLCrequirements, it is necessary to subdivide the scheduling unit in thetime domain. However, excessively subdivided time-domain schedulingunits are not desirable in terms of cell throughput for the eMBB becausethey involve excessive control overhead. In addition, a longertime-section resource assignment structure may be more suitable for thecoverage enhancement in terms of the mMTC.

In accordance with at least one embodiment, a downlink controlinformation configuration and transmission/reception method may beprovided for supporting efficient multiplexing for data traffic betweenrespective services in a network that simultaneously provides services,which are efficient for long time-section resource assignment, such aseMBB and mMTC, and services requiring short time-section resourceassignment, such as URLLC.

The embodiments described below may be applied to user equipments, basestations, and core network entities (MME) using any mobile communicationtechnology. For example, the embodiments may be applied tonext-generation mobile communication (5G mobile communication orNew-RAT) user equipments, base stations, and core network entities{Access and Mobility function (AMF)}, as well as mobile communicationuser equipments adopting LTE technology. Hereinafter, for theconvenience of description, a base station may represent an eNB of anLTE/E-UTRAN or a base station {a CU (Central Unit), a DU (DistributedUnit), or a single logical entity implemented by a CU and a DU} or a gNBin a 5G wireless network in which the CU and the DU are separated.

In the usage scenario of the NR, the URLLC is a service for supportinghigh reliability and low latency, which is used in the case where delayof data transmission/reception causes a serious problem even though asmall amount of data is transmitted/received. For example, the URLLCservice may be used for an autonomous vehicle, wherein if the delay ofdata transmission/reception increases, human and material damages due totraffic accidents may occur.

The eMBB is a service that is used when a large amount of data isrequired to be transmitted/received using a service supportinghigh-speed data transmission. For example, when a large amount of dataneeds to be transmitted per unit time, such as a 3D video or UHDservice, the eMBB service may be used.

The mMTC is a service that is used when low power consumption isrequired while a small amount of data is transmitted/received and thedelay thereof does not cause a problem. For example, the mMTC servicemay be used for sensor devices provided to build a smart city because abattery mounted in the sensor device must be operated for as long a timeas possible.

In general, one of the three services (i.e., the URLLC, the eMBB, andthe mMTC) described above may be provided to a user equipment accordingto the characteristics thereof. Hereinafter, a user equipment using theURLLC service may be referred to as an URLLC user equipment, a userequipment using the eMBB service may be referred to as an eMBB userequipment, and a user equipment using the mMTC service may be referredto as an mMTC user equipment. In addition, the eMBB, the mMTC, and theURLLC may also be interpreted as an eMBB user equipment, an mMTC userequipment, and an URLLC user equipment, respectively.

In the specification, the term “pre-emption” means re-assignment of someof the resources, which have been assigned to the eMBB or the mMTC, tothe URLLC in order to satisfy the latency requirements for the URLLCwhen traffic occurs in the URLLC. Such a term “pre-emption” may also beexpressed using the term “puncturing” or “superposition” as will bedescribed in the embodiments below. However, the present disclosure isnot limited to specific terms. When pre-emption occurs, downlink datatransmission to the eMBB user equipment is interrupted and thus madediscontinuous in the middle of transmission in order to perform downlinkdata transmission to the URLLC user equipment. Therefore, in theembodiment, the occurrence of pre-emption may be interpreted to meanthat discontinuous transmission occurs in the eMBB user equipment, andthe occurrence of pre-emption may be expressed as the occurrence ofdiscontinuous transmission.

At this time, since the resources that have already been assigned to theeMBB or the mMTC are used for the URLLC, the eMBB user equipment or themMTC user equipment having resources assigned thereto is required toreceive information on the resources to be pre-empted. The downlinkpre-emption refers to the pre-emption for downlink resources of the userequipment.

The downlink pre-emption indication information is intended to indicateto the user equipment the data channel that is pre-empted in thedownlink, and the downlink pre-emption indication information may bereferred to as downlink pre-emption notification information because itinforms the user equipment of the downlink pre-emption. The downlinkpre-emption indication information may be transmitted in the form of asignal or a channel.

Hereinafter, various embodiments of a method, in which a user equipmentand a base station transmit and receive downlink pre-emption indicationinformation, will be described in more detail.

The embodiments described below may be applied individually or by meansof a combination thereof.

As described above, to support the URLLC service in the NR, it isnecessary to support a short scheduling unit {or Transmission TimeInterval (TTI)} capable of satisfying a latency boundary in the timedomain. On the other hand, in the case of the eMBB or the mMTC, it maybe efficient to apply a longer time-section resource assignment unitthan a usage scenario of the URLLC in terms of control overhead andcoverage when defining a scheduling unit in the time domain.

In order to satisfy various usage scenarios of the NR as describedabove, it is necessary to support a mixed numerology structuresupporting a numerology of subcarrier spacing (e.g., larger subcarrierspacing, such as 60 kHz, 120 kHz, or the like), which makes it easy todefine a short time-section resource assignment unit suitable for theURLLC, and a numerology of subcarrier spacing suitable for the eMBB andthe mMTC (e.g., 15 kHz for the eMBB or 3.75 kHz for the mMTC) through asingle NR carrier, or to support time-domain scheduling units havingdifferent lengths, such as subframes, slots, or mini-slots, in an NRcarrier that operates as a single numerology.

One example of a method for this may be defined such that time/frequencyresources (or regions), which are assigned based on optimal schedulingunits for the respective usage scenarios, are assigned semi-staticallyand resource assignment is performed using time/frequency resources ofthe region corresponding to the usage scenarios for the respective userequipments according thereto.

However, semi-static resource assignment is inefficient in terms ofradio resource utilization in an environment in which traffic israndomly generated for each usage scenario.

In order to solve this problem, when assigning downlink datatransmission resources, it is required to support dynamicpuncturing-based eMBB/URLLC multiplexing in which some of the downlinkradio resources that have been assigned for eMBB or mMTC datatransmission are punctured and used for urgent URLLC datatransmission/reception or to support superposition-based eMBB/URLLCmultiplexing in which URLLC data transmission signals are superposedonto some of the radio resources to then be transmitted.

In other words, a method is under consideration, which supports dynamicresource sharing between the eMBB and the URLLC such that some resourcesare punctured (or superposed) from among the eMBB (or mMTC) downlinkresources, which have already been assigned and through whichtransmission is ongoing, and are used for urgent URLLC datatransmission.

Additionally, a method is under consideration, in which when a dynamicresource sharing method on the basis of dynamic puncturing (orsuperposition) between the eMBB and the URLLC is applied to NR downlink,a corresponding eMBB user equipment receives an indication on the radioresources punctured for the URLLC data transmission through explicitsignaling.

As the explicit signaling-based indication method, a method ofindicating to the eMBB user equipment the puncturing information withina TTI (or slot, mini-slot, or aggregated slots) in which downlink datatransmission is in progress and a method of indicating to the eMBB userequipment the puncturing information through a TTI subsequent to thecorresponding TTI are under consideration.

In accordance with at least one embodiment, a method may be provided forconfiguring, transmitting, and receiving puncturing indication controlinformation for the eMBB user equipment when applying dynamic resourcesharing between the eMBB and the URLLC as described above.

Although the embodiment will be described based on usage scenarios ofthe eMBB, the URLLC, or the like, from viewpoints of radio resourceassignment and downlink data transmission/reception, the eMBB maycorrespond to a user equipment or a data session in which a longtime-section resource assignment unit in a unit of a slot or aggregatedslots is defined, and the URLLC may correspond to a user equipment or adata session in which a short time-section resource assignment unit,such as a mini-slot, symbol, or large SCS (e.g., 60 kHz or 120kHz)-based slot unit, is defined.

More specifically, the embodiment may be applied to any PDSCHtransmission/reception using partial radio resource puncturing fromongoing downlink transmission, in which puncturing (or superposition) isperformed in a unit of a mini-slot or a symbol from the downlink datatransmission resources assigned in a unit of a slot or slots or in whichonly some frequency resources (some PRBs) are punctured (or superposed)even in the corresponding mini-slot or symbol.

Accordingly, as shown in FIG. 2 below, a first user equipment (e.g., aneMBB user equipment) or data corresponds to downlink data transmissionon the basis of a scheduling unit in a slot unit or a long time-sectionunit, in which the puncturing can be performed among given downlink datatransmission resources in the embodiment. In addition, a second userequipment (e.g., a URLLC user equipment) or data corresponds to downlinkdata transmission in which some of the downlink resources, which havebeen assigned for the eMBB user equipment or data transmission, arepunctured and used.

In accordance with at least one embodiment, a control informationconfiguration method may be provided for indicating to the first userequipment the puncturing of some of the PDSCH transmission resources ofthe first user equipment for PDSCH transmission of the second userequipment as shown in FIG. 2 and a radio resource assignment method fortransmitting and receiving the same.

However, the embodiment is not limited to specific terms. That is, inthe case of applying a pre-emption-based PDSCH multiplexing method, inwhich some of the ready-assigned PDSCH transmission resources (e.g.,some of the first PDSCH transmission resources for the first userequipment) are punctured and used for latency-critical PDSCHtransmission (i.e., second PDSCH transmission for the second userequipment) as a multiplexing method between data transmissions havingdifferent latency requirements or between data transmissions in whichdifferent Transmission Time Interval (TTI)-based scheduling is performedaccording thereto, although downlink control information of a basestation for indicating to the first user equipment information ontransmission resources that are punctured for the second PDSCHtransmission from among the first PDSCH transmission resources isreferred to as puncturing indication downlink control information (DCI),the present embodiment is not limited to that term, and it may also bereferred to using other terms such as pre-emption indication DCI or thelike.

Definition of Downlink Control Information (DCI) Format for PuncturingIndication/Pre-Emotion Indication

A puncturing indication/pre-emption indication DCI format may be definedfor puncturing indication/pre-emption indication, in addition to a DCIformat used for transmitting scheduling control information for resourceassignment used for PDSCH/PUSCH transmission/reception {e.g., a downlink(DL) assignment DCI format and an uplink (UL) grant DCI format}, but thepresent disclosure is not limited to the terms.

As to the example shown in FIG. 2, the puncturing indication/pre-emptionindication DCI format is intended to indicate to a first user equipmentinformation on the radio resources punctured (or superposed) for thesecond PDSCH transmission of the second user equipment from the firstPDSCH transmission resources assigned to the first user equipment.Detailed embodiments for configuring the DCI format, which are proposedin the present disclosure, will be described below.

First Embodiment

Puncturing indication/pre-emption indication information may be definedas being UE-specific signalling. When applying dynamic resource sharingbetween a first user equipment and a second user equipment, it ispossible to perform configuration such that only puncturing for at mostone mini-slot level (or a continuous symbol level) is allowed withrespect to a single PDSCH transmission, which is transmitted in a unitof a slot or slots.

That is, as shown in FIG. 2, definition may be made such that puncturingis allowed for only at most one second PDSCH transmission in the firstPDSCH region. In this case, the DCI format for the correspondingpuncturing indication/pre-emption indication may be defined to includeinformation such as a mini-slot index, a symbol index, or a startingsymbol index for indication of the punctured time-section resources andthe number of symbols constituting the time-section resources (e.g.,starting symbol index+symbol duration).

The length of a mini-slot (i.e., the number of symbols constituting themini-slot), which is a unit of puncturing, a mini-slot boundaryconstituting a single DL (centric) slot, and the number thereof may bedetermined i) through UE-specific/cell-specific higher layer signallingfor respective user equipments, ii) dynamically through a puncturingindication/pre-emption indication signal, or iii) implicitly by asubcarrier spacing (SCS) value set in the corresponding userequipment/cell/slot.

The puncturing indication/pre-emption indication information may includeindication information on punctured physical resource blocks (PRBs) inthe punctured mini-slot. At this time, the information indicating thepunctured PRBs may be defined to i) be signaled in the manner indicatedthrough a bitmap in a unit of a PRB group including assigned PRBs or aplurality of localized or distributed PRBs, or ii) reuse PRB assignmentinformation included in second PDSCH scheduling control information(i.e., a DL assignment DCI format for the second PDSCH of the seconduser equipment).

The puncturing indication/pre-emption indication information may bedefined to include a transmission/pre-emption/puncturing type. However,the present disclosure is not limited to the term above. Thetransmission/pre-emption/puncturing type may be defined as being aninformation region indicating whether the second PDSCH transmission isperformed based on puncturing of the first PDSCH or is performed bymeans of superposition in the radio resources.

The puncturing indication/pre-emption indication information may furtherinclude information on whether to retransmit the first PDSCHcorresponding to the punctured or superposed radio resource regions orall of the first PDSCHs and information on reconfiguration of the PUCCHfor HARQ ACK/NACK feedback of the first user equipment.

Second Embodiment

Puncturing indication/pre-emption indication information may be definedas being UE-specific signalling. Definition may be made such thatpuncturing for PDSCH transmission for a plurality of user equipments orfor a plurality of PDSCH transmissions is allowed in the first PDSCHtransmission for a first user equipment in which PDSCH resourceassignment has been performed in a unit of a slot or slots. That is,definition may be made such that puncturing for a plurality of PDSCHtransmissions, such as a second PDSCH, a third PDSCH, a fourth PDSCH,and the like, is allowed in the first PDSCH region by a basestation/network/cell, as shown in FIG. 3.

In this case, signalling of the puncturing indication/pre-emptionindication information may be configured to be performed for the secondPDSCH, the third PDSCH, and the fourth PDSCH, respectively, throughseparate puncturing indication/pre-emption indication DCI.

More specifically, a single puncturing indication/pre-emption indicationDCI format may be defined to indicate puncturing or pre-emptioninformation through a single PDSCH transmission as shown in the firstembodiment, and when puncturing is performed by means of a plurality ofPDSCHs, a plurality of pieces of puncturing indication/pre-emptionindication DCI corresponding to the number of PDSCHs is separatelyconfigured to then be transmitted to the first user equipment.

As an alternative method for puncturing indication/pre-emptionindication when multiple puncturing is supported, the puncturing by aplurality of PDSCHs may be configured to be simultaneously indicatedthrough a single puncturing indication/pre-emption indication DCIformat. In this case, the puncturing indication/pre-emption indicationDCI format may include an information region indicating the number ofpunctured mini-slots or the number of PDSCHs that are punctured andtransmitted within a corresponding PDSCH TTI.

Since puncturing is performed for three mini-slots or three PDSCHtransmissions in the first PDSCH transmission TTI m FIG. 3, aninformation region for indicating the same may be defined in thecorresponding puncturing indication/pre-emption indication DCI format.

Alternatively, definition may be made such that a bitmap is configuredin a unit of a mini-slot (or in a unit of a symbol or a symbol group)constituting the PDSCH transmission TTI and then the puncturing isindicated in a bitmap manner in the respective mini-slots (or symbols orsymbol groups).

Alternatively, the number of punctured mini-slots or the number ofPDSCHs that are punctured and transmitted may be configured to beimplicitly indicated using an aggregation level of the puncturingindication/pre-emption indication DCI {i.e., a function includingparameters such as the amount of radio resource used for transmission ofthe puncturing indication/pre-emption indication DCI, the number ofcontrol channel elements (CCEs), or a search space (SS) through whichthe puncturing indication/pre-emption indication DCI is transmittedaccording thereto}.

In addition, PRB assignment information in the mini-slot, thetransmission/pre-emption/puncturing type, information on whether toperform retransmission, PUCCH reconfiguration information for HARQACK/NACK feedback of the first user equipment, and the like may betransmitted in the same manner as in the first embodiment describedabove.

However, in the first and second embodiments described above, an RNTIvalue of a user equipment (UE) for monitoring the puncturingindication/pre-emption indication DCI may be equal to a UE-specific RNTIvalue assigned for scheduling DCI format monitoring of the userequipment, or a separate UE-specific RNTI for monitoring DCI indicatingpuncturing may be assigned through higher layer signalling.

Third Embodiment

Puncturing indication/pre-emption indication information may be sentthrough cell-specific or TTI/slot/multi-slot-specific transmission.

More specifically, PDSCH transmission resource assignment information ofthe URLLC that has influenced the PDSCH of the eMBB in a unit of acell/slot/multi-slot may be defined to be transmitted through UE-groupcommon (may also be expressed as group-common) control signalling. Thatis, the puncturing indication/pre-emption indication DCI format may besent through slot-specific or UE-group-specific transmission. Thepuncturing indication/pre-emption indication DCI format may includeinformation indicating the PDSCH transmission resource of the URLLC,which has influenced the PDSCH of the eMBB in the corresponding slot(that is, the PDSCH transmission resource punctured and transmitted fromthe eMBB PDSCH resources).

To this end, a separate UE-group-specific RNTI or acell-specific/slot-specific RNTI may be defined for monitoring thepuncturing indication/pre-emption indication information. The RNTI maybe assigned to each UE-group throughUE-specific/cell-specific/UE-group-specific higher layer signalling. Or,the RNTI may be implicitly defined as a function of a slot index, a cellID, or the like.

A detailed method of configuring an information region of thecell-specific or TTI/slot/multi-slot-specific puncturing indication DCIformat may be conducted according to the first embodiment and the secondembodiment described above.

That is, considering the case in which DCI of a UE-group common forpuncturing indication/pre-emption indication is configured and thecorresponding DCI is transmitted by a base station/network throughUE-group common PDCCH, indication information for punctured/pre-emptedradio resources, which is transmitted through the puncturingindication/pre-emption indication DCI, may include time-section resourceindication information or frequency-section resource indicationinformation, respectively. In addition, the time-section resourceindication information and the frequency-section resource indicationinformation may be configured according to the description of the firstor second embodiment.

As a specific example of this, a pre-emption window and a pre-emptioninterval may be defined to configure information indicating thepunctured or pre-empted time-section resource, but the presentdisclosure is not limited to specific terms.

The pre-emption window may be determined by a transmission period of thepuncturing indication/pre-emption indication DCI or a period of acontrol resource set (CORESET) for the puncturing indication/pre-emptionindication DCI transmission.

For example, the case is considered, in which the puncturingindication/pre-emption indication DCI for notifying ofpuncturing/pre-emption is transmitted in a period of a TTI of the firstuser equipment having a long time-section scheduling unit and a CORESETfor the same is defined, as shown in FIG. 2 or FIG. 3. At this time, theTTI of the first user equipment may be defined as a pre-emption window.

Alternatively, when a signal indicating pre-emption is transmitted in aunit of a plurality of first PDSCH TTIs, a pre-emption window may bedefined in a unit of the plurality of first PDSCH TTIs according to atransmission/reception period of the puncturing indication/pre-emptionindication DCI.

The pre-emption interval may be determined by a time-section schedulingunit used for assigning the resources of the second PDSCH, the thirdPDSCH, and the fourth PDSCH, which perform pre-emption-based PDSCHtransmission/reception by puncturing some of the first PDSCHtransmission resources.

That is, the pre-emption interval may be determined in a unit of a TTIfor PDSCH transmission/reception of the second user equipment, the thirduser equipment, or the fourth user equipment described above.Accordingly, when configuring monitoring configuration information forthe puncturing indication/pre-emption indication DCI of a user equipment(e.g., the first user equipment), in addition thereto, the basestation/network may directly configure information on the pre-emptionwindow and may transmit the same to the user equipment through higherlayer signaling.

Alternatively, it is possible to perform configuration such that thebase station/network transmits, to the user equipment through higherlayer signalling, information for setting a CORESET period formonitoring puncturing indication/pre-emption indication DCI for a userequipment (e.g., the first user equipment) and the user equipment infersinformation on the pre-emption window based on the same.

In addition, configuration information for the pre-emption interval, asdescribed in the first embodiment above, may be i) configured throughhigher layer signalling from the base station/network, ii) dynamicallyindicated through puncturing indication/pre-emption indication DCI, oriii) implicitly configured using a subcarrier spacing (SCS) value usedfor the puncturing indication/pre-emption indication DCI transmission orPDSCH transmission (e.g., the second PDSCH, the third PDSCH, and thefourth PDSCH) in which pre-emption-based resource assignment has beenperformed.

When a pre-emption interval, which is a time-section unit of pre-emptionin the pre-emption window, is defined as described above, the puncturingindication/pre-emption indication DCI, as described in the first orsecond embodiment, may be defined i) to directly indicate an index for apre-emption interval in which pre-emption occurs in the pre-emptionwindow or ii) to indicate a pre-emption interval in which pre-emptionoccurs based on a bitmap.

When directly indicating an index for a pre-emption interval, one pieceof UE-group common puncturing indication/pre-emption indication DCI maybe defined to include information indicating pre-emption for only onepre-emption interval. If pre-emption occurs in a plurality ofpre-emption intervals in the pre-emption window, UE-group commonpuncturing indication/pre-emption indication DCI may be separatelyconfigured and transmitted for the respective pre-emption intervals.

In addition, when the puncturing indication/pre-emption indication DCIincludes bitmap-based pre-emption interval indication information, aplurality of pre-emption intervals, in which pre-emption occurs in thepre-emption window, may be indicated through one piece of puncturingindication/pre-emption indication DCI.

In the case described above, an information region may be separatelydefined to indicate frequency-section resources in which pre-emptionoccurs for the respective pre-emption intervals. The information regionmay be included in the puncturing indication/pre-emption indication DCI.

As a method for configuring information indicating frequency-sectionresources for the radio resources in which pre-emption has occurredthrough the UE-group common puncturing indication/pre-emption indicationDCI, information indicating the frequency-section resources may be RB(Resource Block) or RBG (Resource Block Group)-based bitmap indicationinformation as described in the first embodiment.

It is possible to perform configuration such that a bandwidth part thatis a target of RBG or RB indication information (e.g., a UE-group commonbandwidth part for pre-emption), in which puncturing or pre-emption hasoccurred through puncturing indication/pre-emption indication DCI, isconfigured by a base station/network and is transmitted, through higherlayer signalling, to the user equipment that monitors pre-emptionindication information. In addition, the RB or RBG indicationinformation transmitted through the puncturing indication/pre-emptionindication DCI is indication information for RBs or RBGs constituting abandwidth part for pre-emption, which may be configured by the basestation and may be interpreted by the user equipment.

Alternatively, configuration may be performed such that a plurality ofbandwidth parts for pre-emption are set by the base station andindication information on a bandwidth part in which pre-emption occursand RB or RBG indication information in the corresponding bandwidth partis transmitted through frequency-section resource indication informationof the puncturing indication/pre-emption indication DCI.

In this case, a subcarrier spacing (SCS) value for defining RB gridsconstituting a bandwidth part for pre-emption may be defined i) to beconfigured by a base station/network and to be transmitted via higherlayer signalling, ii) to be dynamically indicated through puncturingindication/pre-emption indication DCI, or iii) to be explicitly orimplicitly configured by subcarrier spacing (SCS) values fortransmission of PDSCHs (e.g., the second PDSCH, the third PDSCH, and thefourth PDSCH) in which the puncturing indication/pre-emption indicationDCI or pre-emption-based resource assignment has been performed.

Alternatively, instead of configuring a separate bandwidth part forpre-emption, it is possible to perform configuration such that RB or RBGindication information, in which pre-emption has occurred with respectto frequency resources constituting the entire band of a correspondingNR component carrier (CC), is configured and transmitted by means of thepuncturing indication/pre-emption indication DCI, and such that the userequipment interprets the RB or RBG indication information based on aUE-common RB grid defined on the basis of the entire band of the NRcomponent carrier (CC).

In this case, a subcarrier spacing (SCS) value defining the UE-common RBgrid may also be defined i) to be configured by a base station/networkand to be transmitted via higher layer signalling, ii) to be dynamicallyindicated through puncturing indication/pre-emption indication DCI, oriii) to be explicitly or implicitly configured by subcarrier spacing(SCS) values for transmission of PDSCHs (e.g., the second PDSCH, thethird PDSCH, and the fourth PDSCH) in which the puncturingindication/pre-emption indication DCI or pre-emption-based resourceassignment has been performed.

Additionally, when information indicating frequency-section resources isconfigured in an RBG unit, the size of the RBG may be i) configuredthrough higher layer signaling from a base station/network, ii)dynamically indicated through puncturing indication/pre-emptionindication DCI, or iii) implicitly defined by subcarrier spacing (SCS)values for transmission of PDSCHs (e.g., the second PDSCH, the thirdPDSCH, and the fourth PDSCH), in which the puncturingindication/pre-emption indication DCI or pre-emption-based resourceassignment has been performed, a bandwidth of the bandwidth part forpre-emption, or a bandwidth of an NR component carrier (CC).

FIG. 4 is a flowchart illustrating a procedure of a user equipment forreceiving downlink pre-emption indication information according to atleast one embodiment.

Referring to FIG. 4, a user equipment may receive monitoringconfiguration information for downlink pre-emption indicationinformation from a base station (S400). The monitoring configurationinformation may include information on whether to monitor the downlinkpre-emption indication.

That is, the monitoring configuration information may includeinformation on whether the user equipment must monitor downlinkpre-emption indication information, which is used to indicate whetherdownlink pre-emption has occurred. For example, an eMBB user equipmentis required to monitor the downlink pre-emption indication informationbecause the resources that have already been assigned to the eMBB userequipment are likely to be pre-empted by an URLLC user equipment.However, an URLLC user equipment may not be required to monitor thedownlink pre-emption indication information because the resources thathave already been assigned to the URLLC user equipment are unlikely tobe pre-empted by another user equipments.

Next, the user equipment may monitor downlink pre-emption indicationinformation based on the monitoring configuration information receivedin step S400 (S410).

If the user equipment monitors downlink pre-emption indicationinformation, the user equipment may receive the downlink pre-emptionindication information from the base station (S420).

At this time, the downlink pre-emption indication information may beindicated through group-common downlink control indication (DCI). Thegroup-common DCI may be transmitted to the user equipment through adownlink control channel (PDCCH). That is, the user equipment mayreceive puncturing indication/pre-emption indication DCI described inthe third embodiment above.

The downlink pre-emption indication information may include a bitmapindicating information on time-section resources or frequency-sectionresources in which pre-emption has occurred, among reference downlinkresources.

Here, the reference downlink resources are target resource to bepre-empted. That is, pre-emption may occur in some region of thereference downlink resources, and the user equipment may determine theregion where pre-emption has occurred in the reference downlinkresources using the bitmap described above.

In this case, a time section of the reference downlink resources may beset by means of the pre-emption window described in the thirdembodiment, and a frequency section thereof may be set by means of thebandwidth part described in the third embodiment.

For example, the above-described bitmap may include 14 bits, wherein abit of the bitmap may indicate one of M different time-section resourcesand may indicate one of N different frequency-section resources. Here, Mand N denote natural numbers of 1 or more.

In this case, (M*N) different resources may be determined by M differenttime-section resources and N different frequency-section resources, andthe respective resources must be mapped with different bits of thebitmap to distinguish between the resources. Therefore, it is possibleto set two cases, where M=14 and N=1 and where M=7 and N=2, among thepairs of natural numbers M*N, which satisfy (M*N)=14.

Then, the user equipment may receive information, which is indicationinformation among the downlink pre-emption indication information, forsetting a unit of a time-section resource and a unit of afrequency-section resource, in which pre-emption has occurred, from thebase station through higher layer signalling. The unit of thetime-section resource may be represented by the pre-emption intervaldescribed in the third embodiment, and the unit of the frequency-sectionresource may be expressed by one or more RBs or RBGs described in thethird embodiment.

For example, the user equipment may receive, from the base station,information on whether M and N correspond to M=14 and N=1 or M=7 and N=2through the higher layer signalling such as an RRC. Then, the userequipment may set, as a time-section resource unit, a value obtained bydividing the total time-section resources of the reference downlinkresources by M, and the user equipment may set, as a frequency-sectionresource unit, a value obtained by dividing the total time-sectionresources of the reference downlink resources by N. At this time, thecase where M and N have values may be expressed using a 1-bit indicatorbecause M and N have values according to one of two cases.

For another example, the user equipment may receive informationexplicitly indicating the number of symbols constituting thetime-section resource unit or the number of RBs (or RBGs) constitutingthe frequency-section resource unit from the base station through higherlayer signalling such as an RRC.

In this case, the time-section resource unit and the frequency-sectionresource unit indicated by a bit of the bitmap may be constant for allof the bits of the bitmap, or may be implicitly determined by means of afunction of an index of the time-section resource (e.g., a slot index)and an index of the frequency-section resource (e.g., an RB index)indicated by a bit.

For example, in the case where the total time-section resources of thereference downlink resources include T symbols when M=14 and N=1, thetime-section resource unit indicated by the first T−([T/14]×14) bits,among 14 bits constituting the bitmap, may be [T/14] symbols, and thetime-section resource unit indicated by the remaining 14−T+([T/14]×14)bits may be [T/14] symbols.

Another example may be configured such that the total time-sectionresources of the reference downlink resources include T symbols when M=7and N=2, the total frequency-section resources of the reference downlinkresources include B PRBs, and 14 bits constituting a bitmap may beconfigured with 7 pairs of bits. In this case, the time-section resourceunit indicated by the first T−([T/7]×7) bits, among 7 pairs of bitsconstituting the bitmap, may be [T/7] symbols, and the time-sectionresource unit indicated by the remaining 7−T+([T/7]×7) bits may be [T/7]symbols. In addition, the frequency-section resource unit indicated bythe first bit, among the pairs described above, may be [B/2] PRBs, andthe frequency-section resource unit indicated by the second bit may be[B/2] PRBs.

FIG. 5 is a flowchart illustrating a procedure of a base station fortransmitting downlink pre-emption indication information according to atleast one embodiment.

Referring to FIG. 5, the base station may configure monitoringconfiguration information for downlink pre-emption indicationinformation (S500). As described with reference to FIG. 4, themonitoring configuration information may include information on whetherto monitor the downlink pre-emption indication.

Next, the base station may transmit the monitoring configurationinformation to the user equipment (S510).

In addition, if downlink pre-emption occurs, the base station maytransmit downlink pre-emption indication information to the userequipment (S520).

At this time, the downlink pre-emption indication information may beindicated through group-common DCI. The group-common DCI may betransmitted to the user equipment through a downlink control channel(PDCCH). That is, the base station may transmit, to the user equipment,puncturing indication/pre-emption indication DCI described in the thirdembodiment above.

The downlink pre-emption indication information may include a bitmapindicating information on at least one of time-section resources andfrequency-section resources in which pre-emption has occurred, from thereference downlink resources.

Here, the reference downlink resources are target resources to bepre-empted. That is, pre-emption may occur in some region of thereference downlink resources, and the base station may transmit, to theuser equipment, information on the region where the pre-emption hasoccurred, among the reference downlink resources, using the bitmapdescribed above.

In this case, a time section of the reference downlink resources may beset by means of the pre-emption window described in the thirdembodiment, and a frequency section thereof may be set by means of thebandwidth part described in the third embodiment.

For example, the above-described bitmap may include 14 bits, wherein abit of the bitmap may indicate one of M different time-section resourcesand may indicate one of N different frequency-section resources. Here, Mand N denote natural numbers of 1 or more, respectively.

In this case, (M*N) different resources may be determined by M differenttime-section resources and N different frequency-section resources, andthe respective resources must be mapped with different bits of thebitmap to distinguish between the resources. Therefore, it is possibleto set two cases, where M=14 and N=1 and where M=7 and N=2, among thepairs of natural numbers M*N, which satisfy (M*N)=14.

Then, the base station may transmit information, which is indicationinformation among the downlink pre-emption indication information, forsetting a unit of a time-section resource and a unit of afrequency-section resource, in which pre-emption has occurred, to userequipment through higher layer signaling. The unit of the time-sectionresource may be represented by the pre-emption interval described in thethird embodiment, and the unit of the frequency-section resource may beexpressed by one or more RBs or RBGs described in the third embodiment.

For example, the base station may transmit, to the user equipment,information on whether M and N correspond to M=14 and N=1 or M=7 and N=2through the higher layer signalling such as an RRC. Then, the userequipment that has received the same may set, as a time-section resourceunit, a value obtained by dividing the total time-section resources ofthe reference downlink resources by M, and may set, as afrequency-section resource unit, a value obtained by dividing the totaltime-section resources of the reference downlink resources by N.

For another example, the base station may transmit informationexplicitly indicating the number of symbols constituting thetime-section resource unit or the number of RBs (or RBGs) constitutingthe frequency-section resource unit from to the user equipment throughhigher layer signaling such as an RRC.

FIG. 6 is a block diagram illustrating a base station according to atleast one of embodiments.

Referring to FIG. 6, a base station 600 includes a controller 610, atransmitter 620, and a receiver 630.

The controller 610 may configure monitoring configuration informationfor downlink pre-emption indication information. As described above, themonitoring configuration information may include information on whetherto monitor the downlink pre-emption indication information.

The transmitter 620 and the receiver 630 are used to transmit andreceive signals, messages, and data necessary for performing the presentdisclosure described above.

The transmitter 620 may transmit the monitoring configurationinformation to the user equipment, and the transmitter 620 may transmitthe downlink pre-emption indication information to the user equipmentwhen downlink pre-emption occurs.

At this time, the downlink pre-emption indication information may beindicated through group-common DCI. The group-common DCI may betransmitted to the user equipment through a downlink control channel(PDCCH). That is, the base station may transmit, to the user equipment,the puncturing indication/pre-emption indication DCI described in thethird embodiment above.

In this case, the downlink pre-emption indication information mayinclude a bitmap indicating information on time-section resources orfrequency-section resources in which pre-emption has occurred, among thereference downlink resources, as described with reference to FIG. 5.

For example, the above-described bitmap may include 14 bits, wherein abit of the bitmap may indicate one of M different time-section resourcesand may indicate one of N different frequency-section resources. Here, Mand N denote natural numbers of 1 or more, respectively.

In this case, (M*N) different resources may be determined by M differenttime-section resources and N different frequency-section resources, andthe respective resources must be mapped with different bits of thebitmap to distinguish between the resources. Therefore, it is possibleto set two cases, where M=14 and N=1 and where M=7 and N=2, among thepairs of natural numbers M*N, which satisfy (M*N)=14.

Then, the base station may transmit information, which is indicationinformation among the downlink pre-emption indication information, forsetting a unit of a time-section resource and a unit of afrequency-section resource, in which pre-emption has occurred, to theuser equipment through higher layer signaling. The unit of thetime-section resource may be represented by the pre-emption intervaldescribed in the third embodiment, and the unit of the frequency-sectionresource may be expressed by one or more RBs or RBGs described in thethird embodiment.

For example, the base station may transmit, to the user equipment,information on whether M and N correspond to M=14 and N=1 or M=7 and N=2through the higher layer signalling such as an RRC. Then, the userequipment that has received the same may set, as a time-section resourceunit, a value obtained by dividing the total time-section resources ofthe reference downlink resources by M, and may set, as afrequency-section resource unit, a value obtained by dividing the totaltime-section resources of the reference downlink resources by N.

For another example, the base station may transmit informationexplicitly indicating the number of symbols constituting thetime-section resource unit or the number of RBs (or RBGs) constitutingthe frequency-section resource unit to the user equipment through higherlayer signaling such as an RRC.

FIG. 7 is a block diagram illustrating a user equipment according to atleast one of embodiments.

Referring to FIG. 7, a user equipment 700 includes a receiver 710, acontroller 720, and a transmitter 730.

The receiver 710 receives, from the base station, downlink controlinformation, data, and messages through a corresponding channel. Morespecifically, the receiver 710 may receive, from the base station,monitoring configuration information for the downlink pre-emptionindication information, and the receiver 710 may also receive downlinkpre-emption indication information.

As described above, the monitoring configuration information may includeinformation on whether to monitor downlink pre-emption indicationinformation.

The controller 720 may monitor downlink pre-emption indicationinformation based on the monitoring configuration information.

The downlink pre-emption indication information may be indicated throughgroup-common downlink control indication (DCI). The group-common DCI maybe transmitted to the user equipment through a downlink control channel(PDCCH). That is, the user equipment may receive the puncturingindication/pre-emption indication DCI described in the third embodimentabove.

The downlink pre-emption indication information may include a bitmapindicating information on at least one of time-section resources andfrequency-section resources in which pre-emption has occurred, among thereference downlink resources. Here, the reference downlink resourcesdenote target resources to be pre-empted as described with reference toFIG. 4.

For example, the above-described bitmap may include 14 bits, wherein abit of the bitmap may indicate one of M different time-section resourcesand may indicate one of N different frequency-section resources. Here, Mand N denote natural numbers of 1 or more, respectively.

In this case, (M*N) different resources may be determined by M differenttime-section resources and N different frequency-section resources, andthe respective resources must be mapped with different bits of thebitmap to distinguish between the resources. Therefore, it is possibleto set two cases, where M=14 and N=1 and where M=7 and N=2, among thepairs of natural numbers M*N, which satisfy (M*N)=14.

Then, the user equipment may receive information, which is indicationinformation among the downlink pre-emption indication information, forsetting a unit of a time-section resource and a unit of afrequency-section resource, in which pre-emption has occurred, from thebase station through higher layer signalling. The unit of thetime-section resource may be represented by the pre-emption intervaldescribed in the third embodiment, and the unit of the frequency-sectionresource may be expressed by one or more RBs or RBGs described in thethird embodiment.

For example, the user equipment may receive, from the base station,information on whether M and N correspond to M=14 and N=1 or M=7 and N=2through the higher layer signaling such as an RRC, thereby setting, as atime-section resource unit, a value obtained by dividing the totaltime-section resources of the reference downlink resources by M, andsetting, as a frequency-section resource unit, a value obtained bydividing the total time-section resources of the reference downlinkresources by N.

For another example, the user equipment may receive informationexplicitly indicating the number of symbols constituting thetime-section resource unit or the number of RBs (or RBGs) constitutingthe frequency-section resource unit from the base station through higherlayer signaling such as an RRC.

The standard details or standard documents mentioned in the aboveembodiments are omitted for the simplicity of the description of thespecification, and constitute a part of the present specification.Therefore, when a part of the contents of the standard details and thestandard documents is added to the present specifications or isdisclosed in the claims, it should be construed as falling within thescope of the present disclosure.

Although a preferred embodiment of the present disclosure has beendescribed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the disclosureas disclosed in the accompanying claims. Therefore, exemplary aspects ofthe present disclosure have not been described for limiting purposes.The scope of the present disclosure shall be construed on the basis ofthe accompanying claims in such a manner that all of the technical ideasincluded within the scope equivalent to the claims belong to the presentdisclosure.

Moreover, the terms “system,” “processor,” “controller,” “component,”“module,” “interface,”, “model,” “unit” or the like are generallyintended to refer to a computer-related entity, either hardware, acombination of hardware and software, software, or software inexecution. For example, a component may be, but is not limited to being,a process running on a processor, a processor, a controller, a controlprocessor, an object, an executable, a thread of execution, a program,and/or a computer. By way of illustration, both an application runningon a controller or processor and the controller or to processor can be acomponent. One or more components may reside within a process and/orthread of execution and a component may be localized on one computerand/or distributed between two or more computers.

What is claimed is:
 1. A method for receiving downlink pre-emptionindication information by a user equipment, the method comprising:receiving monitoring configuration information for downlink pre-emptionindication information from a base station; monitoring downlinkpre-emption indication information based on the monitoring configurationinformation; and receiving the downlink pre-emption indicationinformation from the base station, wherein the downlink pre-emptionindication information comprises a bitmap indicating information on atleast one of time-section resources and frequency-section resources inwhich pre-emption has occurred, among reference downlink resources,wherein respective bits of the bitmap are mapped with differentresources to distinguish between resources and to indicate one of Mdifferent time-section resources and indicates one of N differentfrequency-section resources where M and N are a natural number equal toor greater than 1, wherein the bitmap comprises 14 bits, and wherein Mand N have values such that M=14 and N=1 or M=7 and N=2.
 2. The methodof claim 1, wherein the downlink pre-emption indication information isindicated through group-common downlink control indication (DCI).
 3. Themethod of claim 1, wherein the information for setting a unit oftime-section resources and a unit of frequency-section resources isreceived from the base station through higher layer signaling.
 4. Amethod for transmitting downlink pre-emption indication information by abase station, the method comprising: configuring monitoringconfiguration information for downlink pre-emption indicationinformation; transmitting the monitoring configuration information to auser equipment; and transmitting the downlink pre-emption indicationinformation to the user equipment when downlink pre-emption occurs,wherein the downlink pre-emption indication information comprises abitmap indicating information on at least one of time-section resourcesa frequency-section resources in which pre-emption has occurred, amongreference downlink resources, wherein respective bits of the bitmap aremapped with different resources to distinguish between resources and toindicate one of M different time-section resources and indicate one of Ndifferent frequency-section resources, where M and N are a naturalnumber equal to or greater than 1, wherein the bitmap comprises 14 bits,and wherein M and N have values such that M=14 and N=1 or M=7 and N=2.5. The method of claim 4, wherein the downlink pre-emption indicationinformation is transmitted to the user equipment through group-commondownlink control indication (DCI).
 6. The method of claim 4, wherein theinformation for setting a unit of time-section resources and a unit offrequency-section resources is transmitted to the user equipment throughhigher layer signaling.
 7. A user equipment for receiving downlinkpre-emption indication information, the user equipment comprising: areceiver configured to receive monitoring configuration information fordownlink pre-emption indication information from a base station andconfigured to receive the downlink pre-emption indication informationfrom the base station; and a controller configured to monitor thedownlink pre-emption indication information based on the monitoringconfiguration information, wherein the downlink pre-emption indicationinformation comprises a bitmap indicating information on at least one oftime-section resources and frequency-section resources in whichpre-emption has occurred, among reference downlink resources, whereinrespective bits of the bitmap are mapped with different resources todistinguish between resources and to indicate one of M differenttime-section resources and indicate one of N different frequency-sectionresources, where M and N are a natural number equal to or greater than1, wherein the bitmap comprises 14 bits, and wherein M and N have valuessuch that M=14 and N=1 or M=7 and N=2.
 8. The user equipment of claim 7,wherein the downlink pre-emption indication information is indicatedthrough group-common downlink control indication (DCI).
 9. The userequipment of claim 7, wherein the information for setting a unit oftime-section resources and a unit of frequency-section resources isreceived from the base station through higher layer signaling.